DComTalk.com

I have a PIX 506E. I have recently created a VPN tunnle using IKE and IPSEC with one of our vendors. Only one workstation uses this VPN tunnel and works very well. Here's the problem. The workstation IP address is 192.168.100.49, but the remote side(the vendors side) could only accept IP addresses coming from 10.231.20.x, so I added a NAT rule to translate the 192.168.100.49 ip address to 10.231.20.49. However, since I added the NAT rule, I can no longer access the internet from the 192.168.100.49 workstation. How can I leave the NAT rule in place and still access the internet from the 192.168.100.49 workstation? Any help would be appreciated. Thanks